Electronic device having a curved surface and method for fabricating the same

ABSTRACT

An electronic device having a curved surface is provided. The electronic device having the curved surface includes a back frame having a curved surface, a panel having a curved surface disposed on the back frame having the curved surface, a protective substrate having a curved surface disposed on the panel having the curved surface, and a patterned adhesive element disposed on a portion of the back frame having the curved surface. The back frame having the curved surface and the protective substrate having the curved surface adhere to each other via the patterned adhesive element. The method for fabricating the electronic device having the curved surface is also provided.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of U.S. Provisional Patent ApplicationNo. 63/017,699, filed on Apr. 30, 2020 and China Patent Application No.202110047001.1 filed on Jan. 14, 2021, the entirety of which areincorporated by reference herein.

BACKGROUND Field of the Disclosure

The present disclosure relates to an electronic device, and inparticular to an electronic device having a curved surface and themethod for fabricating the same.

Description of the Related Art

Electronic devices have become indispensable tools in modern life.However, current electronic devices (such as displays) still do not meetexpectations for consumers in all respects. For example, in thetraditional manufacturing process, when fabricating devices with curvedsurfaces, panels are bent through a thermal bending process, which islikely to adversely affect the appearance of the panels. Thus,developing a structural design for improving the quality and efficiencyof the electronic device is one of the research topics in the currentindustry.

BRIEF SUMMARY

An electronic device having a curved surface is provided by someembodiments of the disclosure. The electronic device having a curvedsurface includes a back frame having a curved surface, a panel having acurved surface disposed on the back frame having the curved surface, aprotective substrate having a curved surface disposed on the panelhaving the curved surface, and a patterned adhesive element disposed ona portion of the back frame having the curved surface. The back framehaving the curved surface and the protective substrate having the curvedsurface adhere to each other via the patterned adhesive element.

A method for fabricating an electronic device having a curved surface isprovided by some embodiments of the disclosure. The method includesadhering a panel to a protective substrate using an optical adhesive toform a composite panel; providing a back frame having a curved surface,and disposing a patterned adhesive element on a portion of the backframe having the curved surface; and adhering the composite panel to theback frame having the curved surface through the patterned adhesiveelement by performing a cold bending process to form the electronicdevice having the curved surface.

A detailed description is given in the following embodiments withreference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view illustrating a process for forming anelectronic device having a curved surface in accordance with someembodiments of the present disclosure.

FIG. 2 is a cross-sectional view illustrating an electronic devicehaving a curved surface in accordance with some embodiments of thepresent disclosure.

FIG. 3 is a top view illustrating the electronic device having thecurved surface corresponding to FIG. 2 in accordance with someembodiments of the present disclosure.

FIGS. 4-9 are cross-sectional views illustrating electronic deviceshaving curved surfaces in accordance with some other embodiments of thepresent disclosure.

FIG. 10 is a cross-sectional view illustrating an electronic devicehaving a curved surface in accordance with still some other embodimentsof the present disclosure.

FIG. 11 is a top view illustrating the electronic device having thecurved surface corresponding to FIG. 10 in accordance with still someother embodiments of the present disclosure.

DETAILED DESCRIPTION

The electronic device and the method for fabricating the same in theembodiments of the present disclosure will be described in detail in thefollowing context. It is noted that many different embodiments providedin the following description are used to implement different aspects ofthe embodiments. The specific elements and configurations described inthe following detailed description are set forth in order to clearlydescribe some embodiments of the present disclosure. It will be apparentthat the exemplary embodiments set forth herein are used merely for thepurpose of illustration, and are not used to limit the scope of thepresent disclosure. In addition, the drawings of different embodimentsmay use like and/or corresponding numerals to denote like and/orcorresponding elements in order to clearly describe the presentdisclosure. However, the use of like and/or corresponding numerals inthe drawings of different embodiments does not suggest any correlationbetween different embodiments.

The present disclosure can be understood by referring to the followingdetailed description in conjunction with the accompanying drawings. Itshould be noted that in order to facilitate the reader's understandingand the simplicity of the figures, the multiple drawings in thisdisclosure only depict a part of the electronic device, and the specificelements in the figures are not drawn according to actual scale. Inaddition, the number and size of each element in the figure are only forillustration, and are not used to limit the scope of the disclosure. Inaddition, the number and the size of each element in the figures areonly for illustration, and are not used to limit the scope of thedisclosure.

It should be appreciated that the elements or devices in the figures ofthe present disclosure may be present in any form or configuration knownto those with ordinary skill in the art. In addition, in theembodiments, relative expressions are used. For example, “lower”,“bottom”, “higher” or “top” are used to describe the position of oneelement relative to another. It should be appreciated that if a deviceis flipped upside down, an element that is “lower” will become anelement that is “higher”. The descriptions of the exemplary embodimentsare intended to be read in connection with the accompanying drawings,which are to be considered part of the entire written description.

In addition, the following expression “the first element is disposed onthe second element” includes the conditions where the first element andthe second element are in direct contact, or one or more other elementsare disposed between the first element and the second element so thatthey are not in direct contact.

Certain terms are used throughout the description and following claimsto refer to particular components. As one skilled in the art willunderstand, electronic equipment manufacturers may refer to a componentby different names. This document does not intend to distinguish betweencomponents that differ in name but not function. In the followingdescription and in the claims, the terms “include”, “comprise” and“have” are used in an open-ended fashion, and thus should be interpretedto mean “include, but not limited to . . . ”. Thus, when the terms“include”, “comprise” and/or “have” are used in the description of thepresent disclosure, the corresponding features, areas, steps, operationsand/or components would be pointed to existence, but not limited to theexistence of one or a plurality of the corresponding features, areas,steps, operations and/or components.

In addition, the relative expressions mentioned in the context, such as“upper”, “lower”, “bottom”, “from”, “back”, “left” or “right”, are usedto describe the direction referring to figures. Therefore, thedirectional terms used are for illustration, and are not used to limitthe scope of the disclosure. In the figures, each figures presents thegeneral features of the methods, structures, and/or materials used inspecific embodiments. However, these figures should not be construed asdefining or limiting the scope or characteristics covered by theseembodiments. For example, for the sake of clarity, the relative size,thickness, and position of each layer, region, and/or structure may beshrink or enlarged.

When a corresponding component (such as a film layer or a region) isreferred to as “on another component”, it can be directly disposed onanother component, or other components are disposed between the two. Onthe other hand, when a component is referred to as “directly on anothercomponent”, no component is disposed between the two. In addition, whena component is referred to as “on another member”, the two have avertical relationship in the top view direction. Thus, the component maybe on or under the other one, and the up-down relationship depend on theorientation of the device.

In addition, it should be understood that, although the terms “first”,“second”, “third” or the like may be used herein to describe variouselements, components, or portions, these elements, components, orportions should not be limited by these terms. These terms are only usedto distinguish one element, component, or portion from another element,component, or portion. Thus, a first element, component, or portiondiscussed below could be termed a second element, component, or portionwithout departing from the teachings of the present disclosure.

The terms “about”, “substantially”, “equal”, or “same” generally meanwithin 10% of a given value or range, or mean within 5%, 3%, 2%, 1%, or0.5% of a given value or range. The given value here is an approximatevalue. That is, “about”, “substantially” may be still implied without aspecific description of “about”, “substantially”. In addition, thephrase “in a range from a first value to a second value” indicates therange includes the first value, the second value, and other values inbetween.

It should be appreciated that, in the embodiments described in thefollowing, the several features in different embodiments may bereplaced, reorganized, and mixed to complete other embodiments withoutdeparting from the spirit of the present disclosure. The features of thevarious embodiments can be used in any combination as long as they donot depart from the spirit and scope of the present disclosure.

In the present disclosure, the thickness, length, and width can bemeasured by using an optical microscope, and the thickness can bemeasured by the cross-sectional image in the electron microscope, but itis not limited thereto. In addition, a certain error may be present in acomparison with any two values or directions. If the first value isequal to the second value, it implies that an error of about 10% betweenthe first value and the second value may be present. If the firstdirection is perpendicular to the second direction, the angle betweenthe first direction and the second direction may be between 80 degreesand 100 degrees. If the first direction is parallel to the seconddirection, the angle between the first direction and the seconddirection may be between 0 degrees and 10 degrees.

Unless defined otherwise, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure belongs. It shouldbe appreciated that, in each case, the term, which is defined in acommonly used dictionary, should be interpreted as having a meaning thatconforms to the relative skills of the present disclosure and thebackground or the context of the present disclosure, and should not beinterpreted in an idealized or overly formal manner unless so defined inthe present disclosure.

In the present disclosure, when referring to an element presenting aflat surface or an element having a flat surface, the radius ofcurvature of the element may be greater than or equal to 3000 mm (≥3000mm). On the contrary, when referring to an element presenting a curvedsurface or an element having a curved surface, the radius of curvatureof the element may be less than 3000 mm (<3000 mm).

Referring to FIG. 1, FIG. 1 is a cross-sectional view illustrating aprocess for forming an electronic device having a curved surface inaccordance with some embodiments of the present disclosure. As shown inupper portion of FIG. 1, a composite panel P is formed by adhering apanel 300 to a protective substrate 400 using an optical adhesive 350(such as optical clear adhesive, OCA), but the present disclosure is notlimited thereto. The composite panel P may further include otherelements depending on the requirements.

In the embodiments of the present disclosure, the panel 300 and theprotective substrate 400 may substantially present flat surfaces. Also,the composite panel P, which is formed by adhering the panel 300 to theprotective substrate 400 through the optical adhesive 350, may alsopresent a flat surface. In some embodiments, the thickness T of thecomposite panel P may be about 1.3 mm-3.5 mm, such as about 1.5 mm-3.2mm, or about 1.8 mm-2.9 mm, but it is not limited thereto. The thicknessT of the composite panel P may be adjusted depending on therequirements. The thickness T of the composite panel P may be, forexample, the maximum thickness of the composite panel P.

In some embodiments, the protective substrate 400 may include a flexiblesubstrate, a rigid substrate, or a combination thereof. According tosome embodiments, the materials of the protective substrate 400 mayinclude glass, quartz, sapphire, ceramics, polyimide (PI), polycarbonate(PC), polyethylene terephthalate (PET), polypropylene (PP), anothersuitable material, or a combination thereof, but the present disclosureis not limited thereto. In some embodiments, the materials of theprotective substrate 400 may include soda-lime glass, Al—Si glass,anti-glare glass (AG glass), or another suitable glass, but the presentdisclosure is not limited thereto. In some embodiments, the thickness ofthe protective substrate 400 may be about 0.5-1.7 mm, such as about0.6-1.6 mm or about 0.7-1.48 mm, but it is not limited thereto. Thethickness of the protective substrate 400 may be, for example, themaximum thickness of the protective substrate 400.

In some embodiments, the protective substrate 400 may be formed bygrinding, chemical strengthen, decoration, and/or surface treatment, andother suitable steps, but the present disclosure is not limited thereto.In other embodiments, the protective substrate 400 may add other stepsor omit any one of the above steps depending on requirements.

In some embodiments, chemical strengthen may include ion strengthened,such as strengthened by adding potassium ions (K⁺) or other ions, butthe present disclosure is not limited thereto. In other embodiments, theprotective substrate 400 may be strengthened using other methods. Insome embodiments, decoration may include disposing a shielding layer(such as a black matrix) or another film on the protective substrate400, but the present disclosure is not limited thereto. In someembodiments, surface treatment may include disposing an anti-reflectivefilm, an anti-smudge film or another surface film treatment, but it isnot limited thereto.

In some embodiments, the panel 300 may be a display panel, a touchpanel, a sensor panel, an antenna panel, or another suitable panel. Insome embodiments (not shown), the panel 300 may include a substrate, apolarizer, an electrode, a liquid crystal layer, an alignment layer, adriving circuit layer, a color filter layer, a shielding layer and/orspacer layer, but the present disclosure is not limited thereto. In someembodiments, a substrate of the display panel may include glass, quartz,sapphire, ceramic, polyimide (PI), polycarbonate (PC), photosensitivepolyimide (PSPI), polyethylene terephthalate (PET), another suitablematerial, or a combination thereof, but the present disclosure is notlimited thereto.

In some embodiments, the thickness of the panel 300 may be about 0.8-1.6mm, such as about 1.0-1.5 mm or about 1.1-1.3 mm, but it is not limitedthereto. The thickness of the panel 300 may be, for example, the maximumthickness of the panel 300.

In some embodiments, the optical adhesive 350 may include an opticalclear adhesive (OCA), a liquid optical clear adhesive (LOCA), an opticalclear resin (OCR), another suitable material, or a combination thereof,but the present disclosure is not limited thereto.

In some embodiments, the optical adhesive 350 may first selectivelyadhere to either of the panel 300 or the protective substrate 400, andthen adhere to the other. Thus, the panel 300 and the protectivesubstrate 400 are adhered by the optical adhesive 350 to form thecomposite panel P.

As shown in a lower portion of FIG. 1, a back frame 100 having a curvedsurface is provided for assembling with or adhering to the compositepanel P. In some embodiments, the radius of curvature of the back frame100 having a curved surface may be, for example, less than 3000 mm(<3000 mm). In some embodiments, the back frame 100 having the curvedsurface may include a backboard 1001 and a housing 1002, but the presentdisclosure is not limited thereto. In some embodiments, the housing 1002may be, for example, connected to or disposed on a portion of thebackboard 1001. In some embodiments, the housing 1002 is, for example,disposed correspondingly on at least portions of the edges of thebackboard 1001. In some embodiments, the backboard 1001 and the housing1002 may include the same material or different materials. In someembodiments, the backboard 1001 and the housing 1002 are integrallyformed. In some embodiments, the housing 1002 may be, for example, aportion of protrusion, which extends toward the composite panel P andsupports for the composite panel P, of the back frame 100 having thecurved surface. In some embodiments, the backboard 1001 and the housing1002 may be formed by bonding or welding other materials, and may havethe same material or different materials. In some embodiments, backboard1001 and the housing 1002 may be assembled using other methods.

In some embodiments, the housing 1002 may have different thickness, suchas having a stepped shape or another shape in a cross-sectional view,but the present disclosure is not limited thereto. In some embodiments,the housing 1002 may include a first portion 1002A and a second portion1002B. For example, the thickness T1 of the first portion 1002A may begreater than the thickness T2 of the second portion 1002B, but thepresent disclosure is not limited thereto. The thickness T1 of the firstportion 1002A are defined as, for example, the maximum thickness of thefirst portion. The thickness T2 of the second portion 1002B are definedas, for example, the maximum thickness of the second portion. In otherembodiments (not shown), the thickness T1 of the first portion 1002A maybe, for example, equal to the thickness T2 of the second portion 1002B.In some embodiments, the first portion 1002A and the second portion1002B have the same material, but the present disclosure is not limitedthereto. In some embodiments, the second portion 1002B may be, forexample, closer to a circuit board 600 than the first portion 1002A. Insome embodiments, the panel 300 of the composite panel P may, forexample, be disposed correspondingly on the second portion 1002B andselectively contact the second portion 1002B. In some embodiments, thepatterned adhesive element 200 may, for example, be disposed on thefirst portion 1002A and selectively contact the first portion 1002A. Inother words, the patterned adhesive element 200 may be disposed, forexample, on a portion of the housing 1002 (or the back frame 100). Insome embodiments, the patterned adhesive element 200 and the panel 300may not, for example, overlap each other, or may not adhere to eachother.

In some embodiments, the backboard 1001 and the housing 1002 of the backframe 100 having the curved surface may include metal materials, such ascopper (Cu), silver (Ag), gold (Au), tin (Sn), aluminum (Al), molybdenum(Mo), tungsten (W), chromium (Cr), nickel (Ni), platinum (Pt), titanium(Ti), alloys of the above metals, another suitable material, or acombination thereof, but the present disclosure is not limited thereto.In some embodiments, the back frame 100 having the curved surface may beformed by a lathe or using another method, but the present disclosure isnot limited thereto. As shown in FIG. 1, the patterned adhesive element200 is disposed on a portion of the back frame 100 having the curvedsurface. For example, the patterned adhesive element 200 is disposed onthe first portion 1002A of the housing 1002. Also, the patternedadhesive element 200 may overlap at least a portion of the first portion1002A of the housing 1002, and selectively contact the first portion1002A, but the present disclosure is not limited thereto. In someembodiments, the patterned adhesive element 200 is not disposed on aportion of the backboard 1001 and/or the second portion 1002B of thehousing 1002. In some embodiments, the patterned adhesive element 200does not overlap a portion of the backboard 1001 and/or the secondportion 1002B of the housing 1002, but the present disclosure is notlimited thereto. In some embodiments, the electronic device havingcurved surface include a backlight source 500 and a circuit board 600for driving the backlight source 500, for example, disposed on the backframe 100 having the curved surface. In some embodiments, the circuitboard 600 and/or the backlight source 500 are, for example, disposed onthe backboard 1001 but not overlapped with the housing 1002. In someembodiments, the patterned adhesive element 200 is not be overlappedwith the circuit board 600 and/or the backlight source 500. In someembodiments, the patterned adhesive element 200 is disposed on a portionof the housing 1002 (such as the first portion 1002A) without extendingover the second portion 1002B or the backlight source 500, therebyreducing the light emitted from the backlight source 500 being adsorbedby the patterned adhesive element 200, which would otherwise affectadversely the display performance.

In some embodiments, the patterned adhesive element 200 further includesmaterials having light-shielding property to reduce side light leakage.In some embodiments, the patterned adhesive element 200 may include adouble-sided tape, a light curing adhesive, a light blocking adhesive,another suitable material, or a combination thereof, but the presentdisclosure is not limited thereto. In some embodiments, the thickness ofthe patterned adhesive element 200 may be about 0.01 mm-0.8 mm, such asabout 0.02 mm-0.7 mm or about 0.05 mm-0.6 mm, but it is not limitedthereto. In some embodiments, the backlight source 500 may include, forexample, a direct backlight or an edge backlight. For example, thebacklight source 500 in FIG. 1 is shown as the direct backlight, whilethe backlight source 500 in FIG. 7 in the following may be referred toas the edge back light.

In some embodiments, the backlight source 500 may include a lightemitting diode (LED), cold cathode fluorescent lamp (CCFL), but thepresent disclosure is not limited thereto. The light emitting diode(LED) may include a mini LED, a micro LED, quantum dot (QD)light-emitting diode (such as including QLED, QDLED), fluorescence,phosphor, or another suitable material, and the materials may bearbitrarily arranged and combined, but the present disclosure is notlimited thereto. In some embodiments, an optical element (not shown) maybe selectively disposed between the backlight source 500 and the panel300, such as a diffuser plate, a brightness enhancement film (BEF), oranother suitable optical element.

As shown in FIG. 1, in a cold bending process C, the composite panel P(flat surface) and the back frame 100 having curved surface adhere toeach other via the patterned adhesive element 200 to form an electronicdevice 10 having a curved surface as shown in FIG. 2 and FIG. 3.Specifically, the composite panel P, which includes the protectivesubstrate 400, the optical adhesive 350, and the panel 300,substantially presents a flat surface (that is, the radius of curvatureis substantially greater than or equal to 3000 mm (≥3000 mm)). Referringto FIG. 2, after the cold bending process C, the composite panel P(which includes the protective substrate 400 having the curved surface,the panel 300 having the curved surface, and the optical adhesive 350between them that adheres them together) substantially presents a curvedsurface (that is, the radius of curvature is less than about 3000 mm(<3000 mm)).

In some embodiments, after the cold bending process C, the radius ofcurvature of the composite panel P is substantially greater than 1000 mmand equal to or less than 3000 mm (1000 mm≤the radius of curvature ofthe composite panel P<3000 mm), such as 1200 mm, 1500 mm, 1700 mm, 1900mm, 2200 mm, but the present disclosure is not limited thereto. In someother embodiments, the radius of curvature of the composite panel P isequal to or greater than 1500 mm and equal to or less than 2500 mm (1500mm≤the radius of curvature of the composite panel P≤2500 mm). When theradius of curvature of the composite panel P is less than 1000 mm, thecomposite panel P is likely to be damaged due to small curvature, butthe present disclosure is not limited thereto.

Generally, the thermal bending process is defined as elements being bentat a temperature greater than the softening temperature (such as500-600° C.) of the substrate (such as glass). In contrast, the coldbending process is defined as the element being bent at a temperatureless than the softening temperature of the substrate, such as at anambient temperature. In some embodiment, the cold bending process isperformed at a temperature between about 10° C. and about 60° C. (10°C.≤the temperature≤60° C.), or at a temperature between about 12° C. andabout 50° C. (12° C.≤the temperature≤50° C.), or at a temperaturebetween about 15° C. and about 40° C. (15° C.≤the temperature≤40° C.),but the present disclosure is not limited thereto.

In some embodiments, after the cold bending process C, the radius ofcurvature of the composite panel P may be substantially equal to theradius of curvature of the back frame 100 having the curved surface, butthe present disclosure is not limited thereto. In some embodiments,after the cold bending process C, the shape of the curved surface of thecomposite panel P may be changed substantially following the structuralshape of the curved surface of the back frame 100 having the curvedsurface, but the present disclosure is not limited thereto.

In some embodiments, the cold bending process includes manually ormechanically pressing the composite panel P (presenting a flat surface)onto the back frame 100 having the curved surface, and adhering thecomposite panel P to the back frame 100 having the curved surface viathe patterned adhesive element 200. At this time, the composite panel Ppresents the curved surface. Compared with the thermal bending process,using the cold bending process to bond the composite panel P not onlyobviates the need for high-cost thermal bending equipment, but alsoreduces defects (such as water ripples or pitting or the like) caused bythe thermal bending process to bend the composite panel P (including thepanel 300 and the protective substrate 400). Furthermore, compared withassembling the composite panel having the curved surface with the backframe having the curved surface, assembling the composite panel havingthe flat surface with the back frame having the curved surface providedby the present disclosure may avoid the curvature of radius differencesbetween the composite panel P having the curved surface and the backframe 100 having the curved surface to impact the adhesion yield whenthe composite panel P having the curved surface adheres to (assembledwith) the back frame 100 having the curved surface.

In some embodiments, when the composite panel P having the curvedsurface is required to peel off from the back frame 100 having thecurved surface subsequently, the composite panel P having the curvedsurface may, for example, substantially return to the original flatsurface, assuming that the cold bending process C provided by thepresent disclosure is used to adhere (assembly) the composite panel P tothe back frame 100 having the curved surface. In some embodiments, whenthe back frame 100 having the curved surface is damaged, the compositepanel P having the curved surface adhered thereto may be peel from it,and then the composite panel P may substantially return to the flatsurface. Subsequently, it may be adhered to another undamaged back framehaving a curved surface by the cold bending process C, thereby improvingthe flexibility of fabricating the electronic device having the curvedsurface.

FIG. 2 is a cross-sectional view illustrating an electronic device 10having a curved surface in accordance with some embodiments of thepresent disclosure. FIG. 3 is a top view illustrating the electronicdevice 10 having the curved surface corresponding to FIG. 2 inaccordance with some embodiments of the present disclosure.Specifically, the cross-section line A-A′ of FIG. 3 may correspond tothe cross-sectional view of FIG. 2.

In accordance with some embodiments, the electronic device 10 mayinclude a display device, a light emitting device, a touch device, asensing device, a splice device, other suitable devices or a combinationthereof, but the present disclosure is not limited thereto. Theelectronic device may be a bendable, foldable or flexible electronicdevice. The electronic device may include, for example, a liquid crystaldevice, and may include a backlight module, but the present disclosureis not limited thereto. The display device is used as an exemplaryelectronic device in the following context, but the present disclosureis not limited thereto.

It should be appreciated that in order to clearly describe the presentdisclosure, portions of elements of the electronic device 10 are omittedin the Figures, and thus only some of the elements are illustrativelyshown in Figures. In accordance with some embodiments, additionalfeatures may be added in the electronic device 10 described below. Inother embodiments, a portion of the elements or layers may be replacedor omitted depending on requirements.

Referring to FIG. 2 and FIG. 3, the electronic device 10 having thecurved surface includes the back frame 100 having the curved surface,the patterned adhesive element 200, the panel 300 having the curvedsurface, the optical adhesive 350, the protective substrate 400 havingthe curved surface, the backlight source 500 and/or the circuit board600, and the materials, the structural shape and/or the forming methodof them are mentioned above, and are not repeated here. In someembodiments, the panel 300 having the curved surface is, for example,disposed on the back frame 100 having the curved surface. In someembodiments, the protective substrate 400 having the curved surface is,for example, disposed on the panel 300 having the curved surface. Insome embodiments, the patterned adhesive element 200 is, for example,disposed on a portion of the back frame 100 having the curved surface(such as the first portion 1002A of the housing 1002). In someembodiments, the back frame 100 having the curved surface and theprotective substrate 400 having the curved surface adhere to each othervia the patterned adhesive element 200. In some embodiments, thepatterned adhesive element 200 and the panel 300 having the curvedsurface may not overlap each other, but the present disclosure is notlimited thereto. In some embodiments, the patterned adhesive element 200is disposed on the first portion 1002A of the housing 1002 of the backframe 100 having the curved surface, while the panel 300 having thecurved surface is disposed on the second portion 1002B of the housing1002. In other words, the patterned adhesive element 200 and the panel300 having the curved surface do not adhere to each other. In someembodiments, the panel 300 having the curved surface adheres to theprotective substrate 400 having the curved surface by the opticaladhesive 350. In some embodiments, the electronic device 10 includes thebacklight source 500 disposed between the back frame 100 having thecurved surface and the panel 300 having the curved surface without beingoverlapped with the patterned adhesive element 200.

The patterned adhesive element 200 disposed on the housing 1002 of theback frame 100 having the curved surface may reduce the chance of thelight emitted from the backlight source 500 being partially adsorbed bythe patterned adhesive element 200, thereby reducing the amount of thelight entering the panel 300 and thus impacting the display quality.

In the embodiment of FIG. 2, from the perspective of users, theelectronic device 10 having the curved surface presents, for example, aconvex surface, which means the middle of the electronic device isprotrude from the periphery of the device, but the present disclosure isnot limited thereto. In other embodiments, form the perspective ofusers, the electronic device 10 having the curved surface presents aconcave surface, which means the middle of the electronic device isrecessed from the periphery of the device, but the present disclosure isnot limited thereto. In some other embodiments, the electronic device 10having the curved surface presents a wavy surface, another surfaceshape, or the like. The electronic device in the embodiment of FIG. 2may be also referred to as the direct backlight, and the backlightsource thereof may be arranged on the backboard 1001, for example, in anarray or in some other manner, but the present disclosure is not limitedthereto.

In the embodiment of FIG. 3, the panel 300 having the curved surfaceincludes a display region 300 b and a peripheral region 300 a adjacentto or surrounding the display region 300 b. In some embodiments, from atop view of the electronic device 10, the display region 300 b may bedesigned with different shape depending on requirements, such asrectangular, polygonal, arc, or another suitable shape. In someembodiments, from a top view of the electronic device 10, the peripheralregion 300 a may be designed with different shape depending onrequirements, such as rectangular, polygonal, arc, or another suitableshape. In some embodiments, from a top view of the electronic device 10,the shape of the display region 300 b and the shape of the peripheralregion 300 a may be the same or different.

In the embodiment of FIG. 2 and FIG. 3, from a top view of theelectronic device 10, the area of the protective substrate 400 havingthe curved surface may be greater than that of the back frame 100 havingthe curved surface (as shown in heavy dashed line), and the area of theback frame 100 having the curved surface may be greater than that of thepanel 300 having the curved surface, but the present disclosure is notlimited thereto. In some embodiments, from a top view of the electronicdevice 10, the shape of the panel 300 having the curved surface, that ofthe back frame 100 having the curved surface, and/or that of theprotective substrate 400 may be adjusted depending on requirements. Thepatterned adhesive element 200 may be, for example disposed adjacent toat least an edge of the panel 300 having the curved surface, or may bedisposed on at least an edge of the housing 1002 of the back frame 100having the curved surface. For example, the patterned adhesive element200 may be disposed, for example, adjacent to three edges of the panel300 having the curved surface, but the present disclosure is not limitedthereto. In other embodiments (not shown), the patterned adhesiveelement 200 may be divided into a plurality of sub parts (not shown)separating from each other according to requirements, and the size orthe extending direction of which may be adjusted according torequirements. In other embodiments (not shown), the patterned adhesiveelement 200 may be divided into a plurality of sub parts (not shown)separating from each other according to requirements, and the materialsof which may be the same or different.

In the embodiment of FIG. 2 and FIG. 3, the protective substrate 400having the curved surface may be corresponding to the panel 300 havingthe curved surface, but the present disclosure is not limited thereto.In other embodiment, the protective substrate 400 having the curvedsurface may be corresponding to a plurality of the panel 300 having thecurved surface, which may form a splice device or a device for anotherapplication. The different panels 300 each having the curved surface, asmentioned above, may be, for example, used to display different images,which will be described later in FIG. 10 and FIG. 11.

In some embodiments, the electronic device 10 may be applied to adisplay device for a vehicle, such as an instrument cluster, a head-updisplay (HUD), a center information display (CID), a rear seatentertainment (RSE), or displays for other applications, or the like,but the present disclosure is not limited thereto.

Next, referring to FIGS. 4-9, FIGS. 4-9 are cross-sectional views, whichrespectively illustrate electronic devices 20, 30, 40, 50, 60 and 70having curved surfaces, in accordance with some other embodiments of thepresent disclosure. It should be appreciated that the same or similarcomponents or elements in the following context will be denoted by thesame or similar reference numerals, and the materials, the fabricatingmethods and the functions of which are the same as or similar to theabove, and thus they will not be repeated later.

The electronic device 20 shown in FIG. 4 is similar to the electronicdevice 10 shown in FIG. 2. The difference between the electronic device20 and the electronic device 10 is that the protective substrate 400having the curved surface has a plurality of substrates (such as thesubstrate 410 and the substrate 430), any two adjacent of which areadhere to each other via an adhesive layer 420, but the presentdisclosure is not limited thereto. The mentioned protective substrate410 may have better strength. In some embodiments, the substrate 410 andthe substrate 430 may have the same or different materials, which may besimilar to the materials of the protective substrate 400 describedabove, and thus is not repeated here for brevity. In some embodiments,the adhesive layer 420 may include a thermosetting adhesive layer and alight curing adhesive layer, but the present disclosure is not limitedthereto. In some embodiments, the adhesive layer 420 may includepolyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), thermoplasticpolyurethane (TPU), optical adhesive (OCA), other suitable materials ora combination thereof, but the present disclosure is not limitedthereto. In some embodiments, the radius of curvature of the substrate410 and the radius of curvature of the substrate 430 are substantiallythe same. In some embodiments, in a cross sectional direction of theelectronic device 20, the protective substrate 400 having the curvedsurface may protrude from the back frame 100 having the curved surface.Specifically, the side surface 400S of the protective substrate 400having the curved surface of the electronic device 20 may protrude fromthe side surface 200S of the patterned adhesive element 200 and/or theside surface 100S of the back frame 100 having the curved surface, butthe present disclosure is not limited thereto. In the embodiment wherethe protective substrate 400 has a plurality of substrates (such as thesubstrate 410 and the substrate 430), the protective substrate 400 maybe formed by first cutting, decorating, and/or surface treating thesubstrates (such as the substrate 410 and the substrate 430), and thenadhering the substrates (such as the substrate 410 and the substrate430) to each other by the adhesive layer 420, followed by grinding, butthe present disclosure is not limited thereto.

The electronic device 30 shown in FIG. 5 is similar to the electronicdevice 10 shown in FIG. 2. The difference between the electronic device30 and the electronic device 10 is that in the cross-sectional directionof the electronic device 30, the protective substrate 400 having thecurved surface may be, for example, substantially aligned with the backframe 100 having the curved surface. Specifically, in thecross-sectional direction of the electronic device 30, at least a sidesurface 400S of the protective substrate 400 having the curved surface,at least a side surface 200S of the patterned adhesive element 200having the curved surface, and at least a side surface 100S of the backframe 100 having the curved surface are substantially aligned, but thepresent disclosure is not limited thereto.

The electronic device 40 shown in FIG. 6 is similar to the electronicdevice 10 shown in FIG. 2. The difference between the electronic device40 and the electronic device 10 is that in the cross-sectional directionof the electronic device 40, the protective substrate 400 may berecessed from the edge of the back frame 100 having the curved surface,for example. Specifically, in the cross-sectional direction of theelectronic device 40, the side surface 400S of the protective substrate400 having the curved surface may be, for example, recessed from theside surface 100S of the back frame 100 having the curved surface toreduce the occurrence of the fragments caused by impacted by otherelements, but the present disclosure is not limited thereto. In someembodiments, the side surface 100S of the back frame 100 having thecurved surface may exceed the side surface 400S of the protectivesubstrate 400 having the curved surface by about 10 mm or less, but thepresent disclosure is not limited thereto.

The electronic device 50 shown in FIG. 7 is similar to the electronicdevice 30 shown in FIG. 5. The difference between the electronic device50 and the electronic device 30 is that the direct backlight is replacedby the edge backlight. Specifically, the backlight source 500 and thecircuit board 600 are disposed, for example, adjacent to at least a sideof the light guide plate 800 and/or the reflector 700, which is disposedon the backboard 1001 of the back frame 100 having the curved surface,for example, but the present disclosure is not limited thereto. Thecurved-shape of the electronic device provided by the present disclosuremay be changed depending on the real product design, such as the shapeof the convex surface where the middle of the device protrudes from theperiphery, that of the concave surface where the middle of the devicerecesses from the periphery, that of the wavy surface or another shape,but the present disclosure is not limited thereto.

The electronic device 60 shown in FIG. 8 is similar to the electronicdevice 30 shown in FIG. 5. The difference between the electronic device60 and the electronic device 50 is that from the direction of users'viewing, the electronic device 60 having the curved surface presents aconcave surface, which means the middle of the device is recessed fromthe periphery of the device.

The electronic device 70 shown in FIG. 9 is similar to the electronicdevice 30 shown in FIG. 5. The difference between the electronic device70 and the electronic device 30 is that the electronic device 70 havingthe curved surface presents a wavy surface. Next, referring to FIG. 10and FIG. 11, FIG. 10 is a cross-sectional view illustrating anelectronic device 80 having a curved surface in accordance with stillsome other embodiments of the present disclosure and FIG. 11 is a topview illustrating the electronic device 80 having the curved surfacecorresponding to FIG. 10 in accordance with still some other embodimentsof the present disclosure. Specifically, the cross-section line B-B′ ofFIG. 11 may correspond to the cross-sectional view of FIG. 10.

The electronic device 80 shown in FIG. 10 and FIG. 11 is similar to theelectronic device 10 shown in FIG. 2 and FIG. 3. The difference betweenthe electronic device 80 and the electronic device 10 is that theprotective substrate 400 having the curved surface may, for example,correspond to a plurality of panels (such as two panels) having thecurved surface (such as the panel 300A having the curved surface and thepanel 300B having the curved surface) and/or a plurality of back frames(such as two back frames) each having the curved surface (such as theback frame 100A having the curved surface and the back frame 100B havingthe curved surface). In the embodiment of FIG. 2 and FIG. 3, theprotective substrate 400 having the curved surface corresponds to thepanels 300A and 300B having the curved surface. In some embodiments, thepanel 300A having the curved surface and the panel 300B having thecurved surface may be used to display the same or different displayimages. In some embodiments, the shape or the area of the display region300 b and/or the periphery region 300 a of both of the panel 300A havingthe curved surface and the panel 300B having the curved surface may bethe same or different depending on required design. In some embodiments,the shape or the area of the back frame 100A having the curved surfaceand the back frame 100B having the curved surface may be the same ordifferent depending on required design. In some embodiments, thepatterned adhesive element 200 may be disposed on a portion of the backframe 100A having the curved surface and/or a portion of the back frame100B having the curved surface. In some embodiments, the back frame 100Ahaving the curved surface and the back frame 100B having the curvedsurface may be formed integrally. In some embodiments, the back frame100A having the curved surface and the back frame 100B having the curvedsurface may be adhered to each other by other adhesive elements.

In summary, according to some embodiments of the present disclosure, theelectronic device having the curved surface may be formed by adheringthe composite panel to the back frame having the curved surface throughthe patterned adhesive element. The patterned adhesive element disposedon a portion of the housing may reduce the probability of affecting thedisplay effect, which is caused by the lights emitted by the backlightsource being absorbed by the patterned adhesive element. In addition,according to some embodiments of the present disclosure, the coldbending process used to adhere (assemble) the composite panel and theback frame having the curved surface may reduce the defects likely to becaused by the substrate of the composite panel (such as water ripples orpitting or the like) during the thermal bending process.

While the embodiments and the advantages of the present disclosure havebeen described above, it should be understood that those skilled in theart may make various changes, substitutions, and alterations to thepresent disclosure without departing from the spirit and scope of thepresent disclosure. It should be noted that different embodiments may bearbitrarily combined as other embodiments as long as the combinationconforms to the spirit of the present disclosure. In addition, the scopeof the present disclosure is not limited to the processes, machines,manufacture, composition, devices, methods and steps in the specificembodiments described in the specification. Those skilled in the art mayunderstand existing or developing processes, machines, manufacture,compositions, devices, methods and steps from some embodiments of thepresent disclosure. Therefore, the scope of the present disclosureincludes the aforementioned processes, machines, manufacture,composition, devices, methods, and steps. Furthermore, each of theappended claims constructs an individual embodiment, and the scope ofthe present disclosure also includes every combination of the appendedclaims and embodiments.

What is claimed is:
 1. An electronic device having a curved surface,comprising: a back frame having a curved surface; a panel having acurved surface disposed on the back frame having the curved surface; aprotective substrate having a curved surface disposed on the panelhaving the curved surface; and a patterned adhesive element disposed ona portion of the back frame having the curved surface, wherein the backframe having the curved surface and the protective substrate having thecurved surface directly adhere to each other via the patterned adhesiveelement.
 2. The electronic device having the curved surface as claimedin claim 1, wherein the back frame having the curved surface has abackboard and a housing disposed on a portion of the backboard, whereinthe patterned adhesive element is disposed on a portion of the housing.3. The electronic device having the curved surface as claimed in claim2, wherein the housing is disposed on at least a portion of edges of thebackboard.
 4. The electronic device having the curved surface as claimedin claim 2, wherein the backboard and the housing are integrally formed.5. The electronic device having the curved surface as claimed in claim2, wherein the housing has a stepped shape in a cross-sectional view. 6.The electronic device having the curved surface as claimed in claim 1,wherein the patterned adhesive element comprises a double-sided tape, alight curing adhesive, or a light blocking adhesive.
 7. The electronicdevice having the curved surface as claimed in claim 1, wherein thepatterned adhesive element and the panel having the curved surface donot adhere to each other, and the panel having the curved surfaceadheres to the protective substrate having the curved surface through anoptical adhesive.
 8. The electronic device having the curved surface asclaimed in claim 1, further comprising a backlight source disposedbetween the back frame having the curved surface and the panel havingthe curved surface, wherein the patterned adhesive element does notoverlap the backlight source.
 9. The electronic device having the curvedsurface as claimed in claim 8, further comprising a circuit boarddisposed between the back frame having the curved surface and thebacklight source, wherein the backlight source is electrically connectedto the circuit board.
 10. The electronic device having the curvedsurface as claimed in claim 9, further comprising a light guide plateand a reflector disposed adjacent to the backlight source and thecircuit board.
 11. The electronic device having the curved surface asclaimed in claim 1, wherein the protective substrate having the curvedsurface protrudes from or is aligned with the back frame having thecurved surface.
 12. The electronic device having the curved surface asclaimed in claim 1, wherein the protective substrate having the curvedsurface is recessed from an edge of the back frame having the curvedsurface.
 13. The electronic device having the curved surface as claimedin claim 1, wherein the protective substrate has a plurality ofsubstrates, wherein any two adjacent substrates adhere to each other viaan adhesive layer.
 14. The electronic device having the curved surfaceas claimed in claim 1, further comprising another panel having a curvedsurface disposed on the back frame having the curved surface, whereinthe protective substrate having the curved surface corresponds to thepanel and the other panel.
 15. The electronic device having the curvedsurface as claimed in claim 1, wherein a radius of curvature of theelectronic device is greater than or equal to 1000 mm and is less than3000 mm.
 16. A method for fabricating an electronic device having acurved surface, comprising: adhering a panel to a protective substrateusing an optical adhesive to form a composite panel; providing a backframe having a curved surface, and disposing a patterned adhesiveelement on a portion of the back frame having the curved surface; andadhering the composite panel to the back frame having the curved surfacevia the patterned adhesive element by performing a cold bending processto form the electronic device having the curved surface.
 17. The methodfor fabricating the electronic device having the curved surface asclaimed in claim 16, wherein the cold bending process is performed at atemperature between 10° C. and 60° C.
 18. The method for fabricating theelectronic device having the curved surface as claimed in claim 16,wherein the protective substrate has a plurality of substrates, whereinany two adjacent substrates adhere to each other via an adhesive layer.19. The method for fabricating the electronic device having the curvedsurface as claimed in claim 16, wherein the composite panel has a flatsurface before the step of adhering the composite panel to the backframe, and has a curved surface after the step of adhering the compositepanel to the back frame.
 20. The method for fabricating the electronicdevice having the curved surface as claimed in claim 16, wherein aradius of curvature of the composite panel is greater than or equal to3000 mm before the step of adhering the composite panel to the backframe, and a radius of curvature of the composite panel is less than3000 mm after the step of adhering the composite panel to the backframe.